Implement the work described by the user in the spec or tickets.
Use /tdd where possible, at pre-agreed seams. Default Grok write path is bundled /implement; this skill is the Matt ticket loop only.
Run typechecking regularly, single test files regularly, and the full test suite once at the end.
Once done, use /matt-code-review to review the work.
Commit your work to the current branch.